Yusaf Amin, 18, who worked as a steward at the stadium, offered to sell the items online for a total of £ 4,500.
Security personnel and fans clashed when crowds without tickets tried to storm the arena ahead of the England-Italy game on July 11.
A few hours earlier at 3 p.m., an account on the Facebook marketplace had appeared advertising the articles and “guaranteed entry”, the Willesden Magistrates’ Court heard.
Amin, of Clifford Road, Newham, pleaded guilty to the theft by mail order on Wednesday afternoon.
Prosecutor Edward Aydin told the court that Amin arranged to meet with potential buyers at an Aldi supermarket before he was arrested and arrested.
Reading the post online Mr Aydin said: ‘Housekeeper pass available x2 with uniforms and pass and I’m outside Wembley everyone wants (sic) in.
“I have two passes and two uniforms and bracelets so you can watch the game. I am only looking for serious people. Guaranteed entry or refund. “
He added that the business had been “at high risk” to both game security and ticket buyers.
Amin will be sentenced by Willesden Magistrates’ Court on August 23.
Dalha Mohamad, 18, of Anglian Road, Waltham Forest, was charged with similar offenses but pleaded not guilty at the same hearing.
He is due to be tried by the Willesden Magistrates’ Court on December 17.
The couple appeared in person in court, Amin wearing a white shirt and black tie and Mohamad wearing a thick black quilted coat.
Both were released on bail.