The text is an analysis of two hoards of copper shillings (szeląg) of John Casimir Vasa (1648–1668) dating from the years 1659–1666, found in one of the arable fields at Rokitno (Lubartów County) in 1981 and 2011. The first one is made up entirely of 3,530 copper shillings (so called boratynka in singular), while in the other one, with 10,218 pieces, the same coin type accounts for 99.9%. The structures of these two hoards from Rokitno correspond with some other representative deposits of the same coin type from the localities such as Idźki-Wykno, Przasnysz, Terespol. This particular structure refers, among other things, to percentage shares of the Polish Crown and Lithuanian shillings as well as to how the individual mints and years of issue are represented in these types. The hoard unearthed in 1981 was deposited most probably in the early fourth quarter of the 17th century, whereas the one found in 2011 – shortly after 1695.

The assemblage of coins found in the Old Town district of Lublin (6a, Wincentego Pola St., presently known as Archidiakońska St.) on 1 July 1981 consists of 21 false groschen of Sigismund III Vasa (1587–1632) and 2 fragments of unspecified coins. As a result of the research analysis, it has been found that the coins were minted in tin-coated copper. Despite the fact that the dates are decipherable only on 10 groschen coins, it may be inferred from the identity of the coin dies that 15 of them (71.4%) bear the year 1608, while 5 (23.8%) – 1607. No date has been determined for only one coin. The groschen of 1607, struck with the use of one pair of coin dies, imitate the bust / eagle type. This particular variation tends to prevail also among the pieces with the date 1608 (13 out of a total number of 15 pieces), which had been coined with the use of two pairs of dies. 1 groschen with a bust and 2 groschen with a crown image had been struck by means of some other coin dies. The fact that the forged coins were found at the site of the former townhouse owned by the mayor Jan Szembek (since 1608) allows us to presume that they may have been deposited there as a result of some administrative action taken against the illegal practice. Beginning from the early decades of the 17th century, conditions for the growth of such practices had been created and fuelled by the atmosphere of the increasing economic crisis and the resulting perturbations spreading across the monetary markets of the Polish-Lithuanian Commonwealth.