Hate it when I do that! I assume you’re talking about a
Scamp and the screws for the bunk hinges? You still have the hinges? At a guess, I would use the largest diameter that fits the holes in the hinges and a 1” length. They are pan head screws.
It will be several days before I can get to our
Scamp to check. A phone call to
Scamp might be faster. Have you tried looking for the bunk hinges in the Scamp parts store online? The product description might include the screw size.