Just wondering if I remove IC chips from a High tel (or any grade for that matter) board to sell separately, will the board still be able to be sold in that category or will it get downgraded? Thanks for the insight!

Removing soldered IC will nearly always hurt your grade and the primary statement is it downgrades to mid grade or low grade instantly. (In reality asking and posting can guide you to rare choices that can dodge that to some degree).

Removing socketed ICs other than CPU and co- chips depends on the number of chips removed and the type of board they are in.
Eg a memory expansion board for a mini from 1980 fully populated is high telco but empty is midgrade.
Remove the roms from a commercial lazer printer and the board is still high peripheral.

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Thank you for the insight.

Low/Mid grade boards or Low grade brown boards, are the only boards you can remove as much of the ICs from and still class the same.

It is recommended to do so, if done correctly and neatly.