Cheating or I’m just over thinking

Me and my boyfriend had a pack of condoms place in a bag in our room , last week the condoms weren’t in the bag , a few days later I mentioned them just casually then the next day a “ new pack” appears same brand of condoms but the box said “thin” the original box didn’t say that ..... I’m trying to think of a way to tell him that’s not the original box we had instead of blowing up at him !... the crazy part is I don’t think he’s sleeping around ...