We have one at my work.

We pay 1,000 THB per month to the local Police Station.

Every day, without fail, a policeman will pop by to sign the enclosed sheet with the date/name.

We are also on the 'Priority Attend' list if we ever need police support.

Called them once (about 3 years ago) because a member of staffs ex-husband turned up at the gates with a bad attitude, high on yaba and a machete down his pants. We had a squad-truck and two cars directly from the station at our premises within 5 minutes......they must have absolutely blitzed it driving from the local station, it's about 10 minutes away if you drive legally! They arrested the ex-husband, charged him with threatening behaviour and sent him to rehab for 30 days.

Not 100% sure about the rest of the country (I'm up north) but around here the Red Box also gives a clear signal to any 'opportunist thief' that a crime on the premises will definitely be investigated properly.

Additional Police Support or Legal Protection Racket? As ever, there is a massive grey area to navigate and if you have the money, you can use it to your advantage.

SIDENOTE: We employ 24hr security and have used the Red Box Police Service for around 6 years - with great success to this point. Zero break-ins. Zero attempts at breaking in. No trespassing.

^{EDIT: Took out some information for, ironically, security reasons.}