Many thanks to @keanulatino who have tweeted the following links!
There is an original 8″ x 10″ press photo up for auction on ebeayof Keanu Reeves and Rob Lowe from the celebrity basketball game that was held on April 1, 1990. The photo is here and the writeup here.
Lumal has a different photo of Keanu and Rob from the same basketball game. While it is small on the site, it’s resolution is 300px and it enlarges nicely. It is here.
A photo of Keanu with a fan is here. The info with the photo says it is from 2010 but it looks like it may be from an earlier time period. I don’t recall see him wearing that necklace in 2010 and with that an $1.50 you can buy a cup of cheap coffee.