If it doesn't feel right, it isn't.
I once 'tipped' a dealership parts guy (via proxy... friend of a friend) a 12-pack for a woodgrain dash insert for my brand new 1980 F-150.
I drove that thing for sixteen years and, for sixteen years, a stolen walnut-grained dash insert faced me for about 160,000 miles of driving. It's on my long list of regrets; what seemed ok when I was 23 years old ended up being a bummer for me and the guy who I tempted into theft.
Advice from an old guy: if you're sure you have no soul and/or conscience, go ahead and do it.