Delivery service that waits a few minutes for you to test the delivered item and decide whether you want to keep or return it (no questions asked).
Some items are not available locally so there is no easy way to see them in person before you buy.
Some items need to fitted (clothes, etc) to see if you like them.
Some items might be different in person than they appear online.
Try before you buy, extended to online shopping.
When you order something that you need to test before buying (clothes, etc), or you need to check if something meets your requirements, you pay a little extra to cover:
A few minutes additional time for the delivery person to wait until you have tested the item
Potential return packaging already included in the price
If necessary, shipping back to the manufacturer to remove the fingerprints and package the item in new original packaging
The delivery person hands over the package and explains the procedure. You have X minutes to test the item in the presence of the delivery person. If the item needs to be put on (clothes, etc) you still have to unpack it in front of the delivery person, then go test it in private. The delivery person assumes the temporary role of the shop's clerk and is responsible for the items potential return.
The more of a certain item the seller sells, the more statistics they gain. Based on the stats the seller decides whether to:
a) Send 2 identical items, one is used (just for testing) and would be returned in any case, the other is brand new. The used item is given to the buyer to test, the new item is given to the buyer if they decide to keep it.
b) Send just a new item. Based on statistics there is a high likelyhood that the buyer will keep it. If they decide not to keep it, the item can be put in new generic packaging or sent back to the manufacturer to beautify as if it was never opened.