Parcels

If you were one of the lucky 333 to solve the 22.04.05_Update email riddle, you got a parcel containing ([reference]):

a letter from Sente (with a code on it)
a badge
a tourist information sheet
some cards
stickers

The codes at the bottom of the letter seem to be unique.

Russell_k:             12=T
boac:                  15=E
chippy:                40=T
vibration13:           41=9
rach_hunt:             57=T
lotusflower:           62=E
Muffin:               100=O
number9dream:         109=O
Porka25:              126=O
chrome_halo:          177=A
D4N:                  189=E
gjindancer:           195=E
Xanatos:              198=Y
Der_loki:             251=R
Catfurnace:           259=K
fimacmo:              272=K
dopefiend:            273=K
Lazarus:              283=D
Salkunh:              289=N
tanner:               296=U
Openfly:              300=S
arieh:                312=Y
bocahedron:           326=E
othuum:               328=E
Wishi-san:            332=R
Example:              334=A