leaving purses/bags, cash, and phones in bus at the holocaust museum?

hi yall,

tomorrow my class has a field trip to the holocaust museum (we're from about an hour out) and our staff wants us to leave our purses, bags, cash, cards, phones, etc, everything in the bus. they claim "it'll be locked." they didn't elaborate why, i assume its something to do with distractions or something.

i'm worried tho coz houston isn't the safest place in terms of vehicle robberies and stuff. is the holocaust museum in a nicer part of town or do you think this could be a potential problem?

sorry if this is a stupid question, but ty for your time in advance!