I talked Florentius about old Dawnguards, and he said they were bunch of thieves.

He said they hid their booties somewhere safe by their sigil - not sure whether it's a person or a magical protection.
And he said Arkay told him Sun Fire spell can open it up for me.
At least that's what he said that Arkay said - and he suspects it may be a lie.

I bought that spell from that lady next to him and started looking, but have no clue so far where it is.
Even Flo himself didn't find one yet.
I looked through forum and some people talked about random encounters with dawnguard related npcs with maps and keys, and I think it may be the same stash they were talking about.
Searching wiki didn't have any result - nobody bothered to post anything about that there.

Anybody knows where I can find these easter eggs?

I have a bunch of these notes I found on dead dawnguards myself but I've yet to find the linked treasures, though I admit Im not motivated to search very hard. I assume itll be a bunch of gold and gems to add on top of the pile. My main is nearly a millionaire so why bother.

But then again, if theyre hidden in a way thats only revealed by Sunfire that'd be awesome. Even though I'm playing Volkihar, I did Pacify the Dawnguard spell vendor and snatched their best spells before making their leadership extinct. I guess I'll read the clues again and see.

I'm running out of things to do.
Pretty much easter eggs for me until Dragonborn comes for PC.