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@lupercal wrote:

I'm tossing up between that and simply changing back to 'Standard Parcel'. Unless eBay are actually going to penalise me for doing so (in a way they're not already penalising me for choosing 'untracked letter') at least I'd get my more resonable delivery estimate back, and not be giving people the impression they're going to receive stuff in a paper envelope. 

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The ETA is affected when the tracking is uploaded - if you have a tracked service selected and don't actually upload the number, the ETA will be the same as on an untracked service, and placement in search results may still be affected. ("By uploading valid tracking when an item is sold using an eBay-integrated carrier, you’re protected against Item Not Received claims. It also allows us to give better delivery estimates on when your item will arrive. If you have a low rate of valid tracking on trackable postage services, your listings may be placed lower in search results. ")

I opted to have the untracked letter option on my listings, I wasn't happy about it, but it at least provides accurate service info to buyers...if they look beyond the "standard postage" that's displayed in listings.