Use of mitt in the outfield - OBR
 

I am seeking a penalty for using an illegal glove under OBR.
The play -
F9 takes a 1st basemen’s mitt to play outfield. This is noticed by the team at bat. A few batters into the inning, F9 makes a diving catch and the offense appeals to the umpire regarding use of an illegal glove.

I am aware of the FED rule awarding 3 bases for using an illegal glove (however, this play under FED would NOT be illegal), but I cannot find a penalty under OBR rules.

Thoughts?

You've found everything there is to find. ;)

(iow, remove the mitt, but any plays already made stand)