Roller on drain bung magnet

Was draining backend oil from ur2. two questions?

A roller from a bearing was attached to the magnetic bung. Apx 10mmX1.5 mm. I know this is not good, but is it OK to keep going until the fault identifies itself?

Only 4 litres of oil came out the drain bung centre of gearbox housing. After that 25litres drained out when I removed PTO pack at rear? is that a problem?

That doesn't sound good. Is there any problems that you do know of or can feel when running? It's awful hard for a roller to fall out without there being significant other damage as well. Is it maybe a pin used to connect a lever to something?

The tractor is new to me, but I sence that it does not free-wheel well, like the gearbox is placing to much drag than I expect.?