Hi, new to this. I'm not a stamp collector (I'm more of a coin person), but my parents and a few more family members older than I am used to collect. Me, I haven't even used a stamp in my entire life, I'm too young for that, I grew up with e-mail and mobile phones. So I know absolutely nothing about stamps.
I've posted this in the coin forum under General Discussion, so I'll just copy and paste it here.
I found this box while cleaning out my shelf, it is full of Indonesian stamps from 1951 to 1964. The stamps were curved and rather yellowed from the storage, Indonesia's humidity is a killer for paper.


I've sorted them by denomination (or face value or nominal or something like that?) and found the years, but I have no idea about value. I read a site where a guy was asking several million for each stamp, I read in another site that they were only worth a few US cents each.
Kancil 1956

Kancil 1957

Kopi 1960

Linsang 1956

Banteng 1956, Kelapa 1960, Soekarno 1964? 1965? (used?)

Badak 1956, Soekarno 1961

Transport 1964, Soekarno 1951, Udang 1963

Ganefo 1963

Malaria 1962 (used? just dirty?)

Ganefo 1963

Soekarno 1951

Kakap 1963

Ganefo 1963

Ramayana 1962 (I'm sure this is used)

Soekarno 1964, Soekarno 1953

Soekarno 1951, Asian 1962

Ganefo 1963

Ganefo 1963

Soekarno 1964

Showed these to my dad since I couldn't find anything about them, he said these aren't stamps but they're used for some legal stuff. I don't really understand, but okay, these aren't stamps. They can't be used anymore either because now Materai Tempel needs to be Rp6000 each.

And these aren't all, I found two more envelopes with stamps in them which I haven't seen what stamps are inside. One opened, the other sealed. I remember my aunt giving me the unsealed one, but I don't remember where the sealed one comes from. Unfortunately I've misplaced them, might be a while before I find them again. Probably never if it's gotten mixed up with stuff that isn't mine. There's too much stuff here. It doesn't bother me too much, from the clear window on the envelope it looks like common modern stamps that I've seen many times on advertisement mail.
I would like help determining the value of these stamps. Any tips on conservation would be much appreciated too.
I don't have an album yet, I don't know when I'll be able to get one but it'll probably be a long time. Not very easy to get around here unless you have your own car or someone to drive you.
Thanks!