Hi, JerseyGirl!
This is really an interesting case because everyone concerned--Raven, Janet's family, LE--are being so closemouthed about it. We have heard Nothing about Raven's story, whether he came home and found her that way, When he came home, where he'd been, what he did upon arriving home... Nothing.
A roll of quarters came to mind because of the even figure. Ten dollars. Maybe LE just estimated, although I doubt it, but it is highly unusual that loose change carried anywhere, in a pocket or purse, would come out to exactly ten dollars. If a roll got wet, the paper might have disintegrated and left the coins in a pile. Just speculation, or course.
More speculation is about the blood. It is remotely possible that the stabbing took place by the side door and she was then carried up to the bedroom. If she had run, (and she might not have been able to,) there would have been a trail and they don't mention one. Just two places with bloodstains, separated by a house interior with a stairway.
The other possibility is that the stabbing took place in the bedroom, and the murderer brushed against the outside of the house going out and left blood from clothing there. Which means that the clothing had to be gotten rid of.
If they suspected Raven, they should have looked at his shoes to see if there was creek mud on them. And searched that creek for clothing and a knife. How big is the creek anyway--does anybody know? Even in a small one, clothing and weapons could just be put under rocks.