An Israel Defense Forces video on November 15 showing a tour of Hamas weaponry found at Al-Shifa hospital shows less weaponry at the scene than in later footage filmed by international news crews, indicating the weaponry may have been moved or placed there prior to news crews arriving.
Heck, it’s Gaza, I wouldn’t be surprised to find a gun or two hidden anywhere.
Though hiding guns right next to an MRI machine seems like a bit of a problem if you ever want to turn the MRI machine on.
It’s an active war zone. If someone comes in armed and injured, I assume they strip them. Then some poor janitor or orderly has to play makeshift armory guard until they can figure out the proper way to dispose of grenades and transfer weapons.