These are particularly dain bramaged devices which don't seem to report much (including not reporting which VLANs their ports are using)
hp 1800-24G 14
hp J9028B 19
These are the J9028A and B models (B removed the fan, otherwise identical)
Not picking up VLANs, adjacent nodes and neighbours very well.
hp 1810G-8 1
J9449A - not everything is detected properly but mostly ok.
hp 2524 1
J4813A - seems to work fine.
If at all possible, netdisco inventory results should return the Jxxxx number as well as the marketing name, as this part is the canonical item - HP sell a few devices with the same name and different internals.
Latest HP mibsets attached (May 2014)
https://h10145.www1.hp.com/Downloads/DownloadSoftware.aspx?SoftwareReleaseUId=11143&ProductNumber=J9028B&lang=en,en&cc=us,us&prodSeriesId=3231819&SerialNumber=&PurchaseDate=
Where do you see the Jxxxx number appearing in the inventory? Incorporated into "model"?