encrypted text
Yesterday my friend found an old Pokémon box in our class in the place where we normally keep stuff like cardboard. In that box we found this note and these three cards. I know someone put it there recently since I checked that place lot's of times. I got interested and decided to try and decode this text. I tried rotating letters, then my other friend thought this could be left by scouts who had some kind of activities during the weekend, so we decided to try Scouts ciphers, but none of that made sense. We then tried to look up sites that can decrypt text, but we mostly got error or gibberish, and we tried to ask artifical intelligence, but different ones gave different answers and made no sense. We thought maybe here someone will be able to crack it. We're not sure of the language, it may be french or English. Also on top of it probably someone was writing something on another paper, and it left a print, it's something like "VI3INEKL". What do you think?