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@eol-products wrote:

They had a window for sale with local pick up. I am guessing this is the item so tracking and payment should be no issue. 

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Except if the buyer paid by PayPal or credit card, or some other acceptable payment method before pick up. If they paid with cash on pick up, then yes, do what Twyn said and mark as payment received and item posted. Otherwise, pray to whatever god you pray to that they are honest!