I dont know of Indus automobiles but good that you bought fresh stock parts.
The other paragraph you wrote about is not only for MB but for all brands. The people in this trade in Pakistan have no proper training or knowledge, they just are into it for "maal khareed maal farokht" and they buy the cheapest junk they can get their paws on. I know a few people who actually had import licenses for some japanese origin parts like gaskets, valve guides, clutches etc. They were OK but the retailers with the shops are plain crooks.
I have seen fake Honda genuine parts sold as genuine parts. The part no.stickers were incorrect as they were obsolete nos or other assy nos. When questioned they start from "bhai hum to itna nahin pata" to "lena hai to lo warna jao".. I cannot stand such crooks and morons in business. So its not new they would say ke gaari puraanee hai bhai - ghaneemat samjho ye bhi hai, because they treat parts like FMCG - which does not work.
THen you get the ones who have 10 to 20 year old parts sitting in some bin and they try to sell it to you for current value, YEAH RIGHT, Pak rupee to DM value was quite different then to what Pak rupee to euro is today - so I will not pay 400% profit.