General Understanding my gift list?

[Mia]

Are some of these gifts only active if I don't have the building required for it? Example; I had the elusive headsets for a day or 2. Is that just because I was in the process of building it myself? Then once built, they disappear?

Does this hold true for Laundry, Sweets Factory and Furniture Factory? Once I build 6 of each, I will no longer have those items to gift?

 

[Wasted Eagle]

No. Catering, sweets, laundry and furniture items will stay in your list.

It's temporary gift slots versus fixed gift slots.

Only the gifts in the beginning of the list are temporary, up to fuel catalyst. They are for level 6 onwards town hall, terminal and control tower. Those gift slots change when you complete the build. The slots eventually disappear when your level 10 building is finished.
There are more temporary slots: reserve hangar, mission control center... They also disappear when you complete the highest level building...

Sometimes the fixed slots change after an update. This happened to me last three times.

 

[Mia]

Good info to know, thanks for sharing
It is hard to keep up even tho I try to stay alphabetical.