If the part is indeed a fake, which I highly doubt, then the only plausible explanation is that it's a private enterprise of one of the employees in the parts department. He or she may be collecting empty boxes from the service department, then re-using them to ship out fakes to customers who ordered parts online, while stealing the original (genuine) part that the customer ordered and then selling it on eBay. I can't see any other possible explanation. But even this is very unlikely, I.e. I know it does happen in some other countries where criminality is rife, but I have never heard of it happening in the UK.
Anything is possible since certain people always been greedy and shameful just to make a buck hustling another person.
I know an MB tech (former friend) who had his own specialists MB garage in the near town near me.
I was a frequent customer at this garage.
Unfortunately this MB tech garage owner business concept was to steal autoparts from customers cars then refit stolen parts into his own and his relatives cars just to save a buck, scam 'R us!
His relatives drove expensive Audi's, BMW's and AMG cars with high mileage on odometer.
They needed cheap and reliable parts, how do you get cheap parts without having to pay for part you may think?
Steal parts from low mileage customer cars when cowners come in for service or repairs.
Then he ordered new parts behind customers back and sold them expensively to the customer who got scammed.
The first agreed price on invoice wasn't valid when customer came to pick up his car because the price turned out to be much steeper with the new parts price added to invoice.
Customer had a shock, unfortunately customer didn't know that mechanic had been stealing their parts.
Shop owner is a sneaky and filthy person, I have no sympathy nor do I trust such scammers.
Shop owner also sabotaged customers cars for breakdown for added expenses.
This happened to me and other customers.
This guy was my friend and I trusted him like my own brother, getting stabbed in the back was something I didn't see comming from a friend!?
Judas is everywhere!
Same shop owner is also a nazi sympathizer!
I loathe nazi's.
Unfortunately we have plenty of these filthy sneaky b@stards in Sweden, they are everywhere.