After checking the geocaching rule book........I found this.
page 23, para 4 56:7 if you take the entire amount you must leave something of equal value.
I'd leave a business card, since you are a lawyer. That should be of equal value. I guess. Depends on the type of lawyer too! Maybe 1/3 would be better. Good luck. After you log the cache, that is.
Why not live life like it is your last day....instead of pretending to be a member of the Peter Pan Club and believing you will be around forever.