When I read your message about your lost SD memory card, I immediately saw a dusty area - it brought to mind the area behind my husband's computer tower an area that gets very dusty because I rarely can get in the room to vacuum.
To everyone who leaves a question about lost items on this thread, sometimes I get impressions when reading messages sometimes not, it would be the same with others who read the questions.
Please leave feedback about our replies, we'd love to find out if we had a hit or miss. Even if it's ages afterwards.
I told my daughter's friend where a lost item of hers was, told her it was at the back of a low drawer. She told me that she had looked in all her drawers. About a year later she was packing to move and was pulling things out of the drawer - the item was right where I said it would be, but it was under another item. She was shocked.