This has been updated to match my "Signature Weakness Project." I have done my best to make sure that the original content isn't altered too much, out of respect for any comments.
Another flavorful, specific-to this investigator's abilities, signature weakness. Looking at the two elements, the effect and the discard condition, we get:
The effect: One of the few weaknesses you can just hold onto, although -2 is a steep price. More likely, you will use Dexter Drake's special ability ASAP, kicking out another Asset (with luck a spent Flashlight or a Switchblade or something else cheap and useless) and suffer through a turn at -1 while waiting to ditch it for something else. if you get it during upkeep, that can make for an unpleasant Mythos phase, but what else is new? Dexter has enough options to take a -1 hit on tests for his abilities for a few actions, either by using other options like cards, testless stuff like moving and playing, or just powering through with various boosts. He's never going to want to see this, but it's hardly the most taxing in the game.
The discard condition: Use Dexter's special ability to replace this with any other Asset. Probably the turn after you play it.
All in all, this is a way below average signature weakness.
Box vs book The Scraps are paired with a fairly useful signature asset, Showmanship, and it doesn't compete with the "book" signature set, so players can easily chose to use either of both sets of options, with no clear winner.