Aeolius
Adventurer
sub-plots are your friends....
Perhaps the next town does not allow the open display of weaponry. All weapons are checked at the gatehouse of the captain of the guard. When the PCs return for them, perhaps with a local weaponsmith, to examine the goods for resale, they discover the gatehouse has been ransacked, the guards slain, and the only items missing are those taken from the locathah. The PCs would, of course, be detained for questioning.
Do not make the assumption that common ink and parchment may be used for the scribing of scrolls. Finding the right ink, quill, and parchment can be adventures themselves.
Did he realize that carrying around such rare baubles would attract the attention of.... fiendish locathah!!!
Keep that one in the foreground. Drop clues as to the whereabouts of the slavers. Let him catch up, only to discover the slaves had recently been sold to a band of dwarven miners. When he catches up to the dwarves, he'll find that many of the slaves had been abducted by mind flayers... etc etc etc
Olaf the Stout said:..I wouldn't let him carry into town the 9 light crossbows and 9 longspears that he had taken from some fiendish locathah ...
Perhaps the next town does not allow the open display of weaponry. All weapons are checked at the gatehouse of the captain of the guard. When the PCs return for them, perhaps with a local weaponsmith, to examine the goods for resale, they discover the gatehouse has been ransacked, the guards slain, and the only items missing are those taken from the locathah. The PCs would, of course, be detained for questioning.
I asked where and how he planned to get the paper and materials from. He said that they were common items and he should be able to find them easily.
Do not make the assumption that common ink and parchment may be used for the scribing of scrolls. Finding the right ink, quill, and parchment can be adventures themselves.
He also mentioned that he had converted his excess gold in 500gp each silver pearls!
Did he realize that carrying around such rare baubles would attract the attention of.... fiendish locathah!!!

However the background is that his wife was taken by slavers.
Keep that one in the foreground. Drop clues as to the whereabouts of the slavers. Let him catch up, only to discover the slaves had recently been sold to a band of dwarven miners. When he catches up to the dwarves, he'll find that many of the slaves had been abducted by mind flayers... etc etc etc