I'll see ya and raise. A decade or so back during a national *military weapon amnesty* in Finland, the bored army troopers running one of the collection points found themselves overwhelmed by one Finnish farmer, a veteran of the 1939 Soviet *Winter War* invasion and the following *Continuation War,* who showed up aboard his tractor pulling a donation for them, having finally decided to turn in the 88mm WWII German FlaK 18 cannon that'd remained in his barn for some five decades, along with several dozen rounds of high explosive and armour piercing rounds for the thing.
The real purpose of the *amnesty* was to collect former Finnish Army equipment that'd stuck too well to the fingers of long-serving veterans, explosive ammunition that'd become unstable over the years, mostly WWII German and grenades, and some of the 100,000 Sten guns distributed to the population in expectation of another Red Army visit following their successful vacations in East Germany in '53 and Hungary in '56. Accordingly, picking up the old feller's outdated ammo was probably a wise move, but it was not corroded and rusty, but well-maintained by a gunner who took care of his equipment.
A decade or so back would be 'long about 1996 ... I'm guessing that farmer kept the FlAK around just in case the Soviets came knockin' on the door again. With the USSR defunct, that was no longer necessary.