OK, now we know where, others in the region could step in with local knowledge.
BA does not keep original loadsheets or NOTOCs on the aeroplane- they are handed back after signing. To be honest, it's nice now not to have to try and find these things after the flight, and if they are required by somebody, they can go to the airline. All other paperwork also is not required unless an ASR is raised. Tech log original is required onboard, so copies passed over with the original loadsheet/NOTOC.
Once used to them, ACARs loadsheets work pretty well, but the groundstaff have to be educated well with them. You should still sign a Provisional loadsheet by -20, but that frequently gets bypassed, and you get the everything at the last minute with barely enough time for checking. IF they follow procedures, it works. But then of course,it depends on the whole centralised Load Control getting the ACARS out within a reasonable time after pushback. BA seems to be poor sometimes, with ACARS loadsheets not coming from 4000 miles away until +20 sometimes, causing embarrassing refusals to line up 'awaiting the figures'. It makes crews incandescent sometimes.