Beau Lamarre-Condon has pleaded not guilty to the murders of umpire Jesse Baird, 26, and flight attendant Luke Davies, 29, saying the men died from gunshot wounds during two separate violent struggles.
A statement from Craig Scott, head greenkeeper at Club Cronulla in Sydney's south, was read to the jury during the NSW Supreme Court trial on Tuesday.
Mr Scott said he and his colleague finished their shift on February 20 - a day after Mr Baird and Mr Davies were killed - with their skip bin about three quarters full, the statement said.
When he returned early the next morning, he was surprised to see the lids of the bin propped open with furniture including wooden drawers.
"There were AFL footy shorts still in the plastic packaging ... (and) a group of white flags bunched together near the top of the bin," Mr Scott said in his statement.
"It had a lot of red on them."
Mr Scott and his colleague noticed several black garbage bags and a sliver watch and identification cards belonging to Mr Davies.
"I only took a little bit from the bag, it had red stains on it ... looked like dried blood to me," Mr Scott said.
"(My colleague) and I both thought something suspicious had gone on here."
The greenkeepers reported their find to police, who declared the bin a crime scene.
Prosecutor Brett Hatfield SC previously told the jury Lamarre-Condon saw the skip bin as an appropriate dumping site after driving past the day after the killings.
After the two men died in the terrace on February 19, Lamarre-Condon attempted to clean the scene and left their bodies in surfboard bags in the Paddington home's courtyard through the afternoon and evening, prosecutors allege.
He moved them late that night, the NSW Supreme Court jury has heard.
A detective recalled how Mr Baird's housemates on February 21 spoke about their confusion at the sight of the two surfboard bags.
The housemates are known under pseudonyms in the proceedings.
"They're not mine and they're not Belinda's," housemate Sarah King told Detective Senior Constable Alistair Wright.
"(Jesse's) never had surfboards here and he's never spoken about surfing."
The confusion grew once the two women noticed a pool of red liquid they initially thought to be rust leaking from the bags.
"I don't know if I'm overreacting," Ms King told the detective before showing him a photograph of the liquid.
Lamarre-Condon allegedly dumped the two men's bodies at a rural Greek monastery after unsuccessfully trying to sink them in a dam south of Sydney.
He later handed himself into police.
The trial continues.
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