I have been advised that the cartridge in the second picture has a self-lubricating bullet. There are four holes on the bullet just above the case mouth - two are visible in the picture. They pass all the way through the bullet.
The blanks were described as having been found in a bog. I would expect this to have involved contact with moist dirt, yet the cartridge cases show little damage, although they are blackened somewhat beneath the thin layer of crud, and the paper bullets have even survived in pretty good condition. One of the headstamps has me stumped. I have attached pictures of two examples - it is the character at 9 o’clock that I am interested in. I believe these characters on both cartridges are the same, but with the rounded surface of the head, one just does not appear to have been stamped completely. It appears to be an ‘8’ on its side with a vertical line passing through its center. The headstamps are 92 P III ??