Ivy ~ Your bunny room sounds charming. Is your depression glass bowl the type that is called carnival glass?
Nancy ~ Good advice for your dgson. His parents probably don't give a hoot if all of his toys are in strict order, as long as they're up off the floor in some kind of containers.
Harriet ~ The large box I took to the library was the cardboard box in which latest 2 big LEGO sets were shipped to me from Azon. It is only meant to be temporary so I just used a black marker to write LEGO on the top and all the sides.
I think what we'll eventually try to get is some kind of big crate with wheels, into which we can fit smaller bins. It isn't terribly far from the locked storage room to the meeting room ... until we're carrying umpteen plastic bins of LEGO pieces back and forth.
I was told we could use a flatbed cart on a semi-permanent basis, if I emptied it and moved everything that was blocking it into a far corner. That took some doing, but was worth the effort. The big cardboard box became the 1st layer on the flatbed, then 2 medium plastic bins stacked on that, then smaller bins. That seems like it will work fine until we get another big donation of pieces. However, it is a little precarious (I'm not sure how easily the various lids might pop off if the bins are bumped hard enough to fall), and the cart is tricky to maneuver around the corners.
I also have to assume that I will have to dig it out each time. This time after I emptied the cart itself, I had to clear a path by moving 2 book carts, a broken swivel chair, several boxes of office supplies, and a bag of horse manure from a garden store.
We won't be using the LEGO cart again for a month, who knows what might be set in front of it by then.