The cracked part I pointed out is BMW part number 51221817032, "Circlip", on parts diagram page: bodywork - trunk lid - trunk lid/closing system.
If you can't get in through your back seats at all, apparently dealers drill a hole under the license plate to reattach the mechanism, which I think this video should be a useful reference for.
Other videos I mentioned:
Lock won't turn all the way: https://www.youtube.com/watch?v=wUqbkMC9f4c
Can't get into trunk: https://www.youtube.com/watch?v=pbJjQ7G60qo
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"We will refund your postage when we receive the knife back."
My web forum post about it: https://www.bladeforums.com/threads/crooked-fairbairn-sykes-british-commando-knife-from-sheffield-j-nowill.1577501/