They look to be unsealed?
The back has a perforated tare away strips, and the bottom has a clear tamper sticker.
As to searching - not really.
You can PM me your source if you want.
Currently looking for the following comic Books:
United Comics: 21,22,23,24,26
Tip Top: 173 & 184
Peanuts 1 (1953)
Peanuts: 1-4 (1963-64)