Flotsam at the crossroads of the history
The city of Ostroh (Ostrog) in what is today Western Ukraine has flown many flags over the past 900 years. Just in the last century, it was part of the Tsarist Russian Empire, then Poland, then the Soviets in 1939, then German occupation during WWII, then the Soviets again in 1944, and finally, since 1991, an independent Ukraine.
It should, therefore, be no surprise that when a local house was torn down in the city, it disgorged some interesting contents.

Belted ammo, 7.62x54R on stripper clips, and what looks like a Mosin 91 that has been given an indigenous obrez or SBR treatment

Some German occupation-era matches. The ammo at the bottom looks like either .30 Mauser pistol or Soviet 7.62x25mm Tok.

How about a gently used Steyr-Hahn 1912? Adopted by the KuK as the Repetierpistole M1912, Poland, Germany and others used these through the 1940s, which means this bad boy could have come from numerous sources
Some people get all the luck. The best thing I ever found left behind on a house demo was a coffee cup.