eBay don't read here, only other eBayers here.
We can't see any messages but if you are unsure about the buyer then add the buyer to your blocked bidders list and stop communicating with them.
Is it with regard to the A5100?
⚠ ⚠ ⚠ ⚠ ⚠ STOP PRESS! ⚠ ⚠ ⚠ ⚠ ⚠
Everything that's been posted here by kopenhagen, imastawka, and davewil is important for you to take in. Both kopenhagen and stawka point out that you should trust your gut instinct in this case, and stawka's advice that you cease communicating with this "buyer" (and block them) is spot on in my opinion. davewil has succinctly and clearly outlined what sort of things would signify that you're dealing with a scammer.
I'm not going to be as succinct, but on the other hand, I'm adding animations in the "danger colours" to really bring home the warning message.
Your listing states that it's postage within Australian only. If you have a prospective buyer trying to get you to post a reasonably expensive item outside Australia (when you've listed it as being available within Australia only), that is a warning sign.
If the prospective buyer says they will organise a courier and for you not to worry, that CAN be a scam. (This is usually associated with scams involving cars or other vehicles.) IN PARTICULAR, if the "buyer" wants the item couriered to an overseas address, "CAN be" becomes "probably is".
If the prospective buyer is "working on an oil rig" or says that he/she is working somewhere with limited or no internet or phone, that is a warning sign.
If the prospective buyer mentions "escrow" and "PayPal" and something along the lines of the money not being released until you provide proof of shipping, that is a warning sign.
Just to exapnd on that, this is a typical email sent by the scammer/s, purporting to be from PayPal. (It's not from PayPal. It's merely set up to look as though it's from PayPal. PayPal is not an escrow service.) "You received a payment from {user name blocked for safety} The money is pending and deposited in PayPal escrow account.The payment will not reflect in your account balance until we receive the proof of shipment from you for confirmation and, once shipment is confirmed, the money will be in your available balance within few minutes. This will help us continue to be a safer way to buy and sell." 🢤 FAKE EMAIL. SCAM. DEFINITELY SCAM.
If the prospective buyer mentions Nigeria, that is a warning sign.
There are a few things you really should correct on your listing, by the way.
Spoiler
You state "I can arrange free postage to you if you purchase" but your listing actually has Postage:AU $30.00 Standard Postage (which your postage tab says includes signature on delivery) or local pick-up. You need to be consistent. Get rid of the "I can arrange free postage" text in your listing and stick to the signature on delivery option and the local pick-up option.
You also say "search for its specs on google." That is just lazy, and it also means that you're reducing the number of potential buyers. Buyers on eBay do NOT want to be googling to find the specs; it's your job as the seller to provide them. (Besides, telling your prospective buyers to go away and google means you're sending them off to (possibly) find other listings of the item, some of which might be cheaper. What you should do is google the specs yourself, copy them, and then paste them into your listing. Have EVERYTHING there in your listing so that you attract buyers rather than wave them off.
Also, you should get rid of the "msg me for any inquiry or offers". eBay may interpret that as meaning that you are open to off-eBay offers, and you'll be chastised by eBay as well as charged the Final Value Fee even if you don't sell this item on eBay. (eBay enforce this relentlessly, and they're apt to interpret the most innocent of communications in the worst possible way, so don't put yourself in that position!)
Finally, you may want to reconsider using the words "mint condition". Looking at the photos, I would be inclined to say "very good to excellent condition". State that you cannot see any blemishes. Also - unless you literally used this camera once, don't say that it was. In fact, even if you DID only use the camera once, it's a phrase best avoided because it's so often used (like the used car salesman saying that the car was only driven once a week to church by a lady owner). Say something like, "I used this camera only a handful of times."
