I don't. Young people goofing around, working high/drunk, or just making an exit on their last day of work. I knew a guy who delivers pizzas who said he wants to put magic mushrooms in some random person's deluxe pizza before he quits.
I think it's just a scam to bilk Subway out of money--like people who fake an injury to get money.
I don’t know about NY, but here in Minnesota, the Subway shops always cut the sandwiches in half right before they wrap them up. That would make one foot long into two 6” sandwiches. The knife had a 7” blade. Even in a foot long, a 7” blade would have a handle. It would be awful tricky to hide something like that in a piece of bread and not hit it when they cut it lengthwise to make the sandwich.
I think the guy planted it and wants some money.
If he only would have planted a small paring knife.
I don’t think the Subway shops even have a need for a knife with a 7” blade and probably don’t have any in the store.