Jon Snow #49 along with a few other Game of Thrones Funko Pops were vaulted in May. The others include: Ned Stark #02, Tormund Giantsbane #53, and Bran Stark #67. There has been a total of five common variations of Jon Snow. The only other one that is vaulted is Jon Snow Castle Black #26. Jon Snow #49 was released in June 2017.
The Client from The Mandalorian looks like it will be vaulted in the near future. The Client will be next in line vaulted from this series behind the two Cara Dune Funko Pops. The Client was released in the second wave of Pops from The Mandalorian series in December of 2019.
Negan #390 from The Walking Dead will soon be vaulted. There will be new variation of Negan coming out in August 2021. This may be the reason they are deciding to vault this version. There are also two other store exclusives from the #390 mold. There is a black & white version from ToysRUs and a bloody version from Barnes and Noble. Negan #390 was released in September of 2016.
Gohan #813 from Dragon Ball Z will likely soon be vaulted along with 7 other Dragon Ball Funko Pops including: Future Trunks #313, Tien and Chiaotzu #384, Android 17 #529, Android 18 #530, Yamcha & Puar #531, Super Saiyan Kale #815, and Super Saiyan Caulifla #816. Gohan is the most popular of these and was released in February of 2020 giving it a very short production run. There is also a metallic GameStop exclusive variant of this Pop.