I get this a lot on OfferUp and BuyNothing. To put an end to this, I write on the description page, first and in all caps- PORCH PICKUP ONLY. ALL OR NOTHING. This means, they get to come ang get it from my porch and they need to take the entire 'group' or pile of stuff I have. Not go through the bags/box for what they wanted. Its helped a lot. But also my spouse being on the porch watching them also helps out.