Fishing license questions

[Delawareriver]

I would always forget it when it was pinned to me. Would have to dig through the laundry hamper so now I keep it on my wallet, I always have it then if I decide to stop on my way home from work or find myself with an hour or two to kill why away from home. Any ways I can't remember the last time I was checked even fishing opening day of trout and seeing a co walking by. And when I was checked several years ago they didn't give me a hard time about not having it displayed although I know if I get a hard guy on the wrong day I could be ticketed