I got a couple hundred that have been collecting dust for over a decade, is it worth taking a pic of them or should i expect they are only likely worth 10 bucks each if opened (with box and manual inc ofc)

Depends on the games bud, tbh my opinion, Google each one, or have someone do it for you, and price check each one, some games may be discontinued which may increase the price, some games may drop in price, honestly, just price check em all imo.

price charting site