Bicycle detail

This morning, I found that two of my bicycles disappeared from a bicycle parking lot right next to my house in McCormick Pier Condos.
On Monday, April 13th, I was going to sell one of the bicycles on Facebook Marketplace. (my online ad with a detailed description and pictures is still active). Buyers came to my house, but they did not like the size of the bike for sale, but they liked the second bike. They left and promised to return later.
I left both bikes in the bicycle parking lot next to my door, locked by one bicycle lock.
The buyers no longer contacted me and I decided they found another option.
I did not leave home until this morning, when I discovered the loss. Bicycles disappeared along with the bike lock. I asked the security guard who is less than 100 meters from the bicycle parking, but he did not see anything.
I checked the bikes recently put up for sale on Facebook Marketplace and Craigslist, but I didn’t find anything like mine there.