A statement posted on the band's official website claimed that certain gifts left at the site had been removed and requested that they be returned.
"There were statues of a gargoyle as well as a Buddha that were placed at Paul's grave by his friends and family that were taken," it read.
"We ask that whoever did this please return the items no questions asked. If anyone has any information about the stolen items please let us know by posting in the comments. Thank you for your continued support in this trying time."
Gray, 38, was found dead in an Iowa hotel room in May. An autopsy later discovered that he passed away following an accidental overdose.