Would appear they where a business in the 80's which would fit the time period of the machines, but had previous insolvency issues prior to there winding up in the 2010's.
To me, I'm very very sceptical..... Liquidator hide and seek is playable but i'm not sure why you would do so with machines from the 80's that have seemingly had 40 years of dry storage costs? - Even then I've not seen machines in this country stored and come out looking "new".
The shovel looks extremely genuine.... but I can't make my mind up on the 977, Chains look to be free which would be a miracle IMHO with standing that length of time and only doing 75hrs

It'll all come out in the wash i'm sure.