I agree with Marten: Dr Elicott-Chatham has a lot of interesting hobbies! I'm pretty sure that this started out either as a military project or a humanitarian one to drop rescue packages to people stranded in isolated spots. However, he's found a more fun way to use the technology!
Personally, after Dora gets over the shock of finding a half-dozen space pizzas on the roof, I think that she's going to have the oddest special-of-the-day in the history of the shop.
That said, yeah, there is going to be a similar find on the roof of the apartment building. I have no idea what their landlord is going to think but it looks like Hannelore had better dust off that 'Living in a mansion somewhere' plan of hers because it might be the Plan-B that they're going to need!
It suddenly occurs to me that the way Marten and Hanners are treating this whole scenario tells you a lot about just how strange their lives are. This is seriously, seriously not a major weird event for either of them. It bodes well for Claire that she's letting this roll off her back too!