kattywampus, nice report. Thanks.
Some of these organizations buildings at their back dock area, sadly, becomes a dumping ground, after hours. Organizations that have drop off days soon learn to be a bit fussy and control the donating process. Sadly, they just have to. Garbage fees have skyrocketed.
Yes, the organization gives a receipt of donation, but as you know, the donating person assigns the value and/or claims the value. The church/charity does not assign any value.
Back in the day, we would get a phone call almost weekly from very well meaning older ladies looking to donate (which means take off their hands) a cheesy home organ. These were very popular in the 60's and there are seemingly thousands of them out there and they are now being disposed of. They have no value. Heavy, broken older pianos are somewhat similar. Hard things to get rid of and awkward to remove.
The OP's solution was rather fun. I enjoyed it.