I am in the same boat... completed most tasks just need to finish off this collection one more time but the game has stopped giving out items no matter how many times I fly to the right places whereas before I got items frequently. Clearly this has been done deliberately by the game creators to slow us down or prevent from finishing.. Very frustratingIt's horrible. I got one building within the first day, but since then I've gotten multiples of all items except the cooling vest. I've consistently made sure I had flights of all types going to one of the "Mounts" and still nothing. It's the only collection I still need to complete, and I need to do it twice. Very frustrating!!