I found these metal bearing looking things attached to my drain plug for my oil. I don't know what they are and my car drove perfectly fine when I moved it from my bottom shed to my top garage. What are they?

Even more have come out now. On starting to get worried because I know that the engine and gear box share the same oil. And I dont want either of them damaged

They look like needle bearings - what length and diameter are they?

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13mm in diameter and 3mm in length

With the size of those bits, I would suspect sabotage!

[broken diff bits left in sump?]

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"Show me the Mini!"

They look like 3mm dia x 13 long.
Idler gear bearings or maybe layshaft (less likely unless left behind on assembly).
No needle bearings are in diff..

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Look like idler gear bearings most probably from the gearbox casing side dropping back out into the box, as they'd be unlikely to get out past the gear from the transfer housing side. Is the gear rattling?

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

No she drives fine. I asked a mechanic and he said it could be from the synchro. Is it possible at all?

No. Synchro hubs have 3 balls and springs.

Old rollers could have been left in bottom of box when rebuilt, they can hide behind selector shafts. Seen before.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

These look like 2nd/3rd needle rollers (3-synchro 'box). Listen for exaggerated note or different gear whine accentuated in 2rd or 3rd. If you haven't driven for a while it may be something you're not used to hearing.

Otherwise as said above, needles could have been left behind in a previous build - easily done if not flushed.

F

I usually double clutch the car usually, I took it for a run without double clutching and no noise or anything like that. It shifts up and down smoothly.