Facebook players now can keep unclaimed gifts only 14 days, then they will disappear. Guessing it probably will come to mobile players in the future. 

So those folks with the 100 item limit, who count on using their unclaimed gifts to store items, may be out of luck.
Hoping it's only for facebook, but that's how the 100 item limit started, too.
Per AC facebook: "Why did we do it? Long lists of unclaimed incoming gifts negatively affected game stability and increased loading time"
Hoping it's only for facebook, but that's how the 100 item limit started, too.
Per AC facebook: "Why did we do it? Long lists of unclaimed incoming gifts negatively affected game stability and increased loading time"