The group were made to apologise to the Southsea Model Village staff, who otherwise may not have discovered who broke in.
They will now also volunteer at the attraction to make up for their actions from last Monday.
Mark Wilson, the owner, said: “We had three of the young lads come down to do some voluntary work and the police have spoken to them.
“They were a group of young lads – 13 or 14 years old – who broke in the second time.
“Their mums brought them down during the week. They were so embarrassed about what had happened.
“They said they opened Facebook and saw their sons’ pictures plastered all over it from the break-in.
“They were mortified – they were proper gutted they had to bring their sons down.”
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Their actions cost the business over £500 in broken figurines and £1,200 in ruined model runway tracks.
Following the trespassing, the community rallied around the attraction by starting a GoFundMe page which has raised more than £8,500 in under a week.
The site has now installed more than 10 cameras which record in 4K quality, automatically detect movement and illuminate whoever is being filmed.
Mr Wilson said: “We could never have afforded it without the GoFundMe page. One of our volunteers put it up and it started to go crazy. We’re overwhelmed and amazed by the love the community has shown.
“And we wanted to show people where their money has gone.”
Donations to the GoFundMe page can be made here.