Great find and a great story guys.
My own mother lived in East Germany back in the early 1930's. She was only 7 years old at the time when the war broke out, living and working a small farm with her mother, as her own dad had died a few years earlier.
A few years later, after the allied troops had begun to take over the german troops, things got very bad for many of the farming families that existed there. Since most of the men were taken into the army to fight, (in fact near the end of the war most boys past the age of 13 - 14 were inducted to fight for Hitler), all that were left on these small farms were mainly women and young girls.
My mother recounts having to bury all of their possessions in a panic, and flee from the on coming Russian troops. Everything that could be easily carried was buried as deep as possible. They then had to flee on foot as fast as they could, it wasn't long before the Russian troops would pass them. Once that happened there was nowhere else to go but back to the farm to see what remianed of their belongings. Many of the families that fleed never did make it back to their farms as they were cut down by the Russian troops as they stormed across the countryside. For my mother and my Grandmother, they were to spend the next 2 years in a Russian camp cleaning and caring for the Russian troops. By the time they were finally allowed to leave and return to their farm, most of what was buried was ruined by ground water, or was dug up and taken by the Russian troops stationed in that area, as they knew quite well what signs to look for near each farm that would result in buried treasure.
So yeah, I would gather that there is still hundreds, if not thousands of buried caches like the one that you dug, that for some reason or other were never recovered. This type of event was not limited to just Germany or Poland, but to most of Europe. Both amazing and sad.
Cheers, and good luck on the recovery.
Ralph