diff --git a/configure.py b/configure.py
index 7bc9629fb..6781476ff 100644
--- a/configure.py
+++ b/configure.py
@@ -442,7 +442,7 @@ config.libs = [
             Object(NonMatching, "d/d_kyeff.cpp"),
             Object(NonMatching, "d/d_kyeff2.cpp"),
             Object(NonMatching, "d/d_ky_thunder.cpp"),
-            Object(NonMatching, "d/d_letter.cpp"),
+            Object(Matching,    "d/d_letter.cpp"),
             Object(NonMatching, "d/d_level_se.cpp"),
             Object(NonMatching, "d/d_menu_cloth.cpp"),
             Object(NonMatching, "d/d_menu_collect.cpp"),
diff --git a/include/d/d_letter.h b/include/d/d_letter.h
index 92b3cce7d..277e1d06e 100644
--- a/include/d/d_letter.h
+++ b/include/d/d_letter.h
@@ -1,10 +1,12 @@
 #ifndef D_LETTER_H
 #define D_LETTER_H
 
+#include "dolphin/types.h"
+
 bool dLetter_isNoSend(u16);
 void dLetter_send(u16);
 bool dLetter_isSend(u16);
-bool dLetter_stock(u16);
+void dLetter_stock(u16);
 bool dLetter_isStock(u16);
 void dLetter_read(u16);
 bool dLetter_isRead(u16);
diff --git a/src/d/d_letter.cpp b/src/d/d_letter.cpp
index 4e93971fd..ca4b8b911 100644
--- a/src/d/d_letter.cpp
+++ b/src/d/d_letter.cpp
@@ -3,56 +3,65 @@
 // Translation Unit: d_letter.cpp
 //
 
-#include "d_letter.h"
-#include "dolphin/types.h"
+#include "d/d_letter.h"
+#include "d/d_com_inf_game.h"
+
+enum dLetterStts_e {
+    NOSEND_e,
+    SEND_e,
+    STOCK_e,
+    READ_e,
+};
 
 /* 801990CC-80199108       .text dLetter_isNoSend__FUs */
-void dLetter_isNoSend(unsigned short) {
-    /* Nonmatching */
+bool dLetter_isNoSend(u16 idx) {
+    return dComIfGs_getEventReg(idx) == NOSEND_e;
 }
 
 /* 80199108-8019913C       .text dLetter_send__FUs */
-void dLetter_send(unsigned short) {
-    /* Nonmatching */
+void dLetter_send(u16 idx) {
+    dComIfGs_setEventReg(idx, SEND_e);
 }
 
 /* 8019913C-8019917C       .text dLetter_isSend__FUs */
-void dLetter_isSend(unsigned short) {
-    /* Nonmatching */
+bool dLetter_isSend(u16 idx) {
+    return dComIfGs_getEventReg(idx) == SEND_e;
 }
 
 /* 8019917C-801991B0       .text dLetter_stock__FUs */
-void dLetter_stock(unsigned short) {
-    /* Nonmatching */
+void dLetter_stock(u16 idx) {
+    dComIfGs_setEventReg(idx, STOCK_e);
 }
 
 /* 801991B0-801991F0       .text dLetter_isStock__FUs */
-void dLetter_isStock(unsigned short) {
-    /* Nonmatching */
+bool dLetter_isStock(u16 idx) {
+    return dComIfGs_getEventReg(idx) == STOCK_e;
 }
 
 /* 801991F0-80199224       .text dLetter_read__FUs */
-void dLetter_read(unsigned short) {
-    /* Nonmatching */
+void dLetter_read(u16 idx) {
+    dComIfGs_setEventReg(idx, READ_e);
 }
 
 /* 80199224-80199264       .text dLetter_isRead__FUs */
-void dLetter_isRead(unsigned short) {
-    /* Nonmatching */
+bool dLetter_isRead(u16 idx) {
+    return dComIfGs_getEventReg(idx) == READ_e;
 }
 
 /* 80199264-801992A0       .text dLetter_delivery__FUs */
-void dLetter_delivery(unsigned short) {
-    /* Nonmatching */
+void dLetter_delivery(u16 idx) {
+    if (dLetter_isSend(idx))
+        dLetter_stock(idx);
 }
 
 /* 801992A0-801992DC       .text dLetter_autoStock__FUs */
-void dLetter_autoStock(unsigned short) {
-    /* Nonmatching */
+void dLetter_autoStock(u16 idx) {
+    if (dLetter_isNoSend(idx))
+        dLetter_stock(idx);
 }
 
 /* 801992DC-80199308       .text dLetter_isDelivery__FUs */
-void dLetter_isDelivery(unsigned short) {
-    /* Nonmatching */
+bool dLetter_isDelivery(u16 idx) {
+    return !dLetter_isNoSend(idx);
 }