I do not think using words such as "likely" and "I suspect" constitute asserting anything. Those doors and plugs are designed to wedge themselves against the se

I do not think using words such as "likely" and "I suspect" constitute asserting anything. Those doors and plugs are designed to wedge themselves against the seal when they are in place. Just looking at them from the outside will not give any indication as to whether they are bolted. A few rapid vertical jolts (which might occur in flight) could jar them loose without the bolts. There is no damage to the structure of the plane. Bolts on planes are either carter pinned, safety wired or have a nylon ring to prevent loosening. They generally don't just fall off - not to mention having several fall off simultaneously.