" ... On another note, I've looked on Google maps at the Waimanalo Convenience Center and it's not very big. Would a place like this be staffed? ..."
The Waimanalo Convenience Center is fenced and always staffed by a couple people when open. It's locked up when not open. It's not a big facility, just a place where you drive in and go up a ramp and staff questions what you have and then directs you to dump your stuff into the appropriate, large dumpsters or recycling area. Then big trucks come and take the dumpsters to the real landfill or recycling locations elsewhere, which happens regularly. I don't think trash sits around there for days since the volume of drop offs fills the dumpsters fairly quickly.
I've always been extremely dubious of the "homeless person finding the album" story. After I read that the AF brother, supposedly, has worked at this Convenience Center, a whole lot of more likely scenarios came to mind. I've been to this facility numerous times and, due to the fencing, staffing and unappealing location surrounded by fields and dense brush, I just don't think it likely that a homeless person scaled the fence at night, rooted around the dumpster that hadn't been hauled away yet, and decided to take and preserve some family's random album. That doesn't pass the smell test, so to speak.
I'm pretty certain homeless or others are not allowed to roam around there when it's open. There are very visible warning signs that you're not allowed to sift through or take anything there, plus the staff would tell them to leave. Sure, someone might jump the fence and root anyway, but why preserve the album? I'm not buying it. If the album was at the Convenience Center, it was someone who knew or knew of the family and situation and pulled it out, for whatever reason. Or maybe someone just "claimed" it was found by a homeless person, but they already had it for other reasons, either good or nefarious. JMO MOO