I do recommend the display perch, btw. I know that we were allowed to send some coloring pages to Package Pick-Up at the front of the park one time - so I am guessing they will send your box. To be sure to get your banshee home safely - you do kind of need it. The box SEEMS way too big - but the banshees are awkwardly shaped and surprisingly take more space than you expect.
Unless you are getting a droid backpack or immediately heading back to your resort - after you make your droid - I strongly suggest sending it to Package Pick-Up or directly to your resort - in the box they give you. Without the droid backpack - they are awkward to lug around.
Glad to hear it about the coloring pages--if they'll send something like that, it seems like odds are good they'll send the box. I've been defaulting to having it sent to my resort, but if they'll only send it to Package Pick-Up that's fine, too; it's just one additional step that evening. Glad to hear a recommendation for the perch, too; it's the kind of add-on thing I never used to buy but it seems like it'd be nice to have back at home.
Re: the droid, I got measurements for the R units off these boards and bought a cross-body bucket bag wide enough and deep enough to hold one--actually a little too deep; I may bring a jacket or towel to stuff in the bottom of the bag so the droid's head can poke out. I didn't really want to gamble on whether the backpacks would be in stock, and I'd rather have it on my hip than on my back so I can see when it interacts with the environment. That's part of the appeal of the droid, so I wouldn't want to immediately send it away after making it.
Re: getting the banshee home safely, though...that's what's beginning to niggle at me and make me wonder if I should hold off on the banshee this trip. I'd rather keep all the more expensive souvenirs in my carry on, but at this point I've committed to both a droid and a lightsaber. The lightsaber will have to be one of my two carry-on items on its own, and I was going to carry the droid on either in the bucket bag or a small backpack to stow under the seat. If I add the banshee to the mix, I'll either have to put it and the droid both in a larger carry-on backpack (I have a Mother Lode Jr. from eBags--I'd have to get banshee measurements and measure the inside of the bag to figure out if that's possible; the bag itself fits under an airline seat if needed) or just pack the banshee as well as I can in its box and put the box in my checked bag--which is, unfortunately, a rolling duffel, not a hard sided case. It may be okay if I put it at the bottom of the duffel where the underside is structured and pad around and on top with clothes (and maybe clothes inside the box so it doesn't have any negative space), but I don't know that I like doing that. If I wait until the 2021 trip to get a banshee, I won't have the lightsaber and I can just take the banshee in its box as a carry-on item by itself. After they took away the lenticular photos at Momento Mori, though, I'm a little bit leery of holding off for a year at a time on cool souvenirs--there's never a guarantee they won't get discontinued.