This is one case where more info might not necessarily hurt but may cause issues.
Per ATF 478.125 "The record shall show the date of receipt" so recording both the purchase date and the date of receipt would be confusing at best and non-compliant with the required record-keeping at worst if audited. Maybe not a big deal but I wouldn't want to have to redo my book because of it. The required format just has "Date" not "Dates"
I'm also firmly in the camp that "date of receipt" is when the firearm is actually, well, received.
I use a second spreadsheet to record all the other details, like purchase date, price, estimated value, accessories that came with it, contact info for seller (email, phone, etc), condition, detailed description (markings and whatnot), all that good stuff. That spreadsheet is organized by type/mfg or whatever makes sense, not by acquisition date like the official ATF bound book. All that extra info shouldn't be in the bound book.
