No, I don't have access to his personal account. You used to be able to mark something as purchased on someone else's. They removed that functionality. Now there's no way for other people to know that item was purchased.
I don't recall ever seeing that option. However, there are a couple of things you can do.
First, you can just delete the item from the wish list. If you have it, you don't need it so you can remove from the wish list.
The other thing you can do ONLY if it has not already been purchased from Amazon. You can create another wishlist and maybe call it "Purchased" and move the item to that wish list. You can make these extra lists public or private. If you purchase something from Amazon, it will show in the original list with the appropriate filter of "Purchased" or "Unpurchased" or "Unpurchased". You have to delete it and then add it to the separate list if you want it there.
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There is no such thing as a stupid question!
Corollary -- so long as you read before you post and stay on topic. :)
Yea, I used that feature quite a bit this past x-mas. It helped my sister keep track of what gifts I had purchased for my niece and nephew. Looks like we'll have to figure out a different way to do that for next x-mas unless Amazon puts the feature back in.