There are things you didn't think to mention. Do you have your own front door/ back door where you leave these boxes?
If others in the building are using the same entrance and exit to the building, I can well understand why they move the boxes that to them are cluttering the place up. The boxes could too be in the way for them getting in and out.
Surely, even although you do not walk well, it makes more sense to take the recycling right out to the bin once, thus solving the problem. If you are on your own, or just you and your husband, I imagine you usually have the same amount as we do, which can quite conveniently be thrown out in one go.