some yes. left over weapon. they can booby trap buildings, attach explosives to apc/tanks. maybe some rpg. Occasional rocket info Israel. A bunch of undiscovered tunnels

but now after their command was wiped out and they can't sell aid, they have serious financial problems (they need to pay their fighters. it's very transactional).

but in case idf will leave gaza, they will have enough power to dominate the strip.