I am a TN dealer so all paperwork was handled accordingly. Having sold hundreds of cars luckily the only keys I have ever needed were made at an Ace Hardware. They were always pretty inexpensive. The keys were simple too tho.

I told him I’m sorry he lost the only key and reminded him that was the main reason I sold the car....I didn’t want to lose the only key so .....do you wanna buy my car or not? Lol. Oh well he checked around and the lowest price he found was $450

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Current stable......
17' Rogue SV 70k
11’ Saab 9-5 NG 94k
10’ e550 4matic 185k

sold
02' e320 210k
00' e430 167k
01' e320 171k (regret sale)
91' 300d 2.5t 300k (sold to ecoofidaho)
79' 240d 177k (old yellow my avatar)
87' 300d 169k (junk but fast)
85' 300tdt 261k (RBM parts delivery)
85' 300dt 68k (one owner cream puff)
82' 240d 250k
84' 300dt 198k (sold to diesel don)
91' 190e 2.3 61k
88' 260e 140k