A body was subsequently recovered from the lake and officers said they are confident it is that of Mr Buchel who has not been seen since March 13.
DCI Chris Jones, Homicide and Major Crime Command, said he was keen to hear from anyone who can build up a "fuller picture" of Neil Buchel's movements between March 13 and April 1.
"I would also reiterate appeals to anyone who has used the lakes recently if they have noticed anything unusual. In particular any local anglers who may have seen any suspicious activity or any new faces not usually present at the lakes,” he added.
Police have appealed to local anglers and fishermen for information following the discovery of a human leg in a lake in Dagenham.
Detective Chief Inspector Chris Jones, of the Homicide and Major Crime Command, said:
I would like to ask anybody who has used the lakes over recent weeks whether they have noticed any unusual or suspicious activity.
Have you seen anybody putting something into the water? Have you noticed anybody who you have not seen there before? Any information, no matter how trivial you may think it to be, could be crucial to establishing what happened and I would urge you to speak with my team.
Anyone with information have been urged to contact the incident room on 020 8345 3734 or if you wish to remain anonymous Crimestoppers on 0800 555 111
Remains of a human leg have been found in a lake in Dagenham, police have said.
Police were called to White Hart Lakes, near Chase Road after a member of the public reported seeing an item floating in the water.
Initial indications revealed that the item is part of a human leg but further forensic analysis is being conducted.
Police investigating the disappearance of Neil Buchel, 39, of Dagenham, are aware of the discovery and have informed his family although officers said it was too early to say whether the find is linked.