In the swap page, you have the option to ‘edit my collection’ and then for each coin, ‘add to my collection’
To me, it makes sense that clicking ‘add to my collection’ would prepopulate the dialog box:
Grade, where specified in the trade
Quantity - likewise specified in the trade
Buying value - if this was specified by the trader
Aquisition place - the swapper
Aquisition date - the day you are entering it
Pictures - if they were attached the the traded coin.
These would only be defaults, so I could easily change the grade etc if needed, but for the majority of coins I would not need to manually enter all of this information.