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Start at 54.6, 57.7, talk with Schildi, and activate the endeavor.
The souvenir locations are marked on the mini map with a red 'X'.
I found 48 of them, there might be more. Two of them were mobile.
Each one gives 50 housing XP, 10 Gemeinschaftscoupons, and 10 Nebelwappen des Abenteurers.
You can probably reach the housing XP cap, and definitely reach the Nebelwappen des Abenteurers cap by collecting all of these.

At 54.2, 57.9 you will find Rada, who has Schriftrolle des salzigen Souvenirs: Osten, Schriftrolle des salzigen Souvenirs: Westen, and Schriftrolle des salzigen Souvenirs: Süden.
I was not able to get these scrolls to work, maybe try one to see if it works for you first, Rada only buys them back for half of what you paid.

Rada <Schriftrollenverkäufer>