First off, you can roll that UPS stock anytime you want.
Secondly, doing some simple math, assuming that a driver gets screwed on two hours of pay each day, which happens to more people than you think, probably more than who actually contribute to their 401k, we're talking about 10 hours per week, or $215. Multiply that by 52 weeks and we're talking about $11,180 per year. And if it's just a half hour per day, that amounts to $2795 per year. Also more than the 401k match. So extrapolate that out to a 20 year career and by investing that 11,180 into your own fund, without a company match, and you'll have over $400,000 at retirement, assuming just 4% growth. At 8%, that number climbs to to well over $600,000. And this from just investing the delay pay that you have been getting screwed out of for years.
And obviously, you can throw that extra half hour pay into your account as well and come out as well as you would if you were getting the company match.
Don't be so short sighted by discounting the improvements compared to the one thing you're losing.