Looks to be some sort of cock fertility talisman gently lay amongst his possessions.
That's a Palad khik :
Thai amulet that is shaped like a penis. The phrase "palad khik" means "honorable surrogate penis".
These amulets range from a few inches to several feet long in length. The smaller versions are usually worn on the body while the larger versions are displayed in shops and other establishments.
Palad Khik originated in India and relate to the Hindu god Shiva, who is usually represented by Shiva Linga. They were brought to Thailand from Cambodia hundreds of years ago by the Khmer.
Palad Khiks are usually worn by males on a cord around their waist under the clothes and off-center from the real penis. It is not unusual for a male to wear many palad khiks at the same time, in the hope to attract women, increase gambling luck and protection from dangerous objects such as bullets and knives.
At times, women in Thailand also carry it in their purses to protect them from rape and mugging. Shop owners display them in their shops or in the cash register area to protect their business and also bring good luck and sales.
A notable feature of this type of amulet is it can be worn in places considered as lowly or unclean such as bars, gambling casinos and brothels. Normally, you cannot bring a Buddhist amulet inside such establishments.