Accidentally pushed through a body access plug on my W211....will set me back $4.

So what's the purpose of these holes in the first place...if they're plugged? Does the same sheet metal design get used on different models, some where there's a use for the hole and others where there's not?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife