Welp! That is alot.
<lootgroup name="groupMailbox02">
<item name="resourcePaper" count="1,5" loot_prob_template="high"/>
<item group="booksAllScaled" loot_prob_template="low"/>
</lootgroup>
<lootgroup name="groupMailbox01">
<item group="perkBooksT0Day1" loot_prob_template="ProbT0"/>
<item group="groupMailbox02" loot_prob_template="ProbT1"/>
<item group="groupMailbox02" loot_prob_template="ProbT2Cap"/>
</lootgroup>
<lootprobtemplate name="ProbT0">
<loot level="0,1" prob="0.03"/>
<loot level="2" prob="0.07"/>
<loot level="3" prob="0.10"/>
<loot level="4" prob="0.13"/>
<loot level="5" prob="0.17"/>
This is the loot probability for books and the booksAllScaled from mailbox 2 is set to low. And the early perkbooks that you get on day 1 uses the ProbT0 template. It increases as you level.
Also this is the early game books you can get on day 1 from mailboxes. So I guess these was the ones you got, right?
Code:
<!-- *** Early_Game_Perk_Books -->
<lootgroup name="perkBooksT0Day1">
<item name="bookRangersArrowRecovery"/>
<item name="bookRangersCripplingShot"/>
<item name="bookRangersKnockdown"/>
<item name="bookRangersFlamingArrows"/>
<item name="bookRangersAPAmmo"/>
<item name="bookRangersExplodingBolts"/>
<item name="bookRangersForestGuide"/>
<item name="bookSpearHunter1Damage"/>
<item name="bookSpearHunter2Maintenance"/>
<item name="bookSpearHunter3SteelSpears"/>
<item name="bookSpearHunter4StrongArm"/>
<item name="bookSpearHunter5RapidStrike"/>
<item name="bookSpearHunter6PuncturedLung"/>
<item name="bookSpearHunter7QuickStrike"/>
<item name="bookNeedleAndThreadDesertWear"/>
<item name="bookNeedleAndThreadDusters"/>
<item name="bookNeedleAndThreadFootwear"/>
<item name="bookNeedleAndThreadLegwear"/>
<item name="bookNeedleAndThreadPockets"/>
<item name="bookNeedleAndThreadPufferCoats"/>
<item name="bookNeedleAndThreadWinterWear"/>
</lootgroup>