What do you suggest if we can not locate an agent's submission guidelines? For instance, ICM does not seem to post them anywhere. I remember that you like a query letter, synopsis and first ten pages, but can't recall if this is your personal preference or a good standard if we are unsure what to send.
I suggest it means they aren't looking for unsolicited material.
However, that never deterred anyone I know so this is when the default "industry standard" kicks in:
1. Novels: query letter of ONE page max, with 5-10 pages of writing with a #10 SASE.
2. NF-Query letter of TWO pages max, with a #10 SASE.
This is where it can be VERY helpful to have met one of the agents at a conference. That reminder of the meeting is your FIRST sentence in the query letter.