Anyone living in the places where these kinds of mailboxes are used for collecting the mail must be very discrete about what they order. If you have no other choice but to utilize these mailboxes too then maybe you should consider ordering only the stuff that fits in there.
Not the perfect size
Otherwise, people end up with situations like these, where the courier tried to fit the package into a mailbox way smaller than the package. The funny thing is that there is actually a bigger hole on the other side of these boxes which could be used but apparently the delivery person didn’t realize that.