I am grateful for any help
Which of the #BTC24 events did you plan to exhibit the artwork and isn't it late now? If it is not, I suggest you report the issue to a local authority like the police around the suspected environment where it got lost. I also suggest that you check for surveillance footage, if you can trace one, to probably trail what happened or who's likely to get hold of it. If it got missed at the venue of the exhibition, it makes it easier to find using the above suggestions I made. Also try to inform the local art galleries around town by giving them a description of what your artwork looks like. Lastly, I will advise you to also monitor online stores like eBay, Craigslist amongst others for any listing that may look like your missing artwork. Please don't forget to insure your artwork next time because you could have reached out to insurance company to file a claim. Good luck!