As a euro parts guy, I would not be shocked to find a febi part in a MB box at all in 2018. Don't shoot the mechanic or parts guy until you're sure they screwed up, which is always possible.

You should also get that kinda stuff in writing before hand imo, when I write up an invoice for mechanical work at the joint I work for, each line item on the itemized invoice is a PN and it has what brand it is. Sloppy ass lazy shops lump stuff together on the bill often times.

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K