Four lambs and two goats were stolen from Aldenham Country Park before a number of remains were found.
The animals were stolen from the farm between 6pm on Sunday, April 21 and 9am on Monday, April 22.
Over the Easter bank holiday, lamb carcasses were found in Borehamwood, and police confirmed the tags on them matched those of the lambs that went missing from the farm – the two goats, however, which were kids, have yet to be found.
Police are still investigating and have followed up a number of enquiries and conducted searches without positive outcomes.
Any witnesses or anyone with information about the theft should call Hertfordshire Constabulary on the non-emergency number 101 quoting crime reference 41/36222/19.