@Anthony608 Generally speaking, I don't contact guests regarding items left behind unless they appear to have at least some real sentimental or personal value.
I don't worry about phone chargers, single socks, or even pairs of socks, inexpensive jewelry etc. I do reach out if I find souvenir items obviously purchased during the trip, or very unusual things like a small card game in a special case.
People have left behind umbrellas (people take them, people leave them). A pair of souvenir Chicago Blackhawks towels (they told me I could keep those). A (basically dead) tablet computer, which went to recycling (I think that was just dumped), jackets or larger clothing items.
I keep a small supply of USPS standard priority mail flat-rate boxes. There's no weighing needed - if an item fits in the box, it ships for the flat rate of the box. Since I already know the prices, it's easy to set something up through the Resolution Center if the guest wants the item back.
I'm running by the post office once or twice a week anyway, so I just mail the package on a regular run.
One guy had me use his Fedex account to send his daughters clothing items back. Fedex has a dropoff at a building I visit regularly.
It seems to be happening less since Covid - singles or couples booking my space rather than groups, who, I think, end up leaving things under bedding.