25 sounds fine, we usually use 24 as its mostly clear maybe it could be the fallback if 25 is full.
We also have a code for any finds so those listening in don't know what we are talking about so they don't come in and kindly clean out our spot for us the next day.
That way those with your group can come over and share in your find in peace.
The code word is changed each trip so no one can pick up a pattern.