13092 Ornithomimus Hat 30-Day Pack
13116 Ornithomimus Hat 30-Day Pack
13288 Ornithomimus Hat 7-Day Pack
13353 Ornithomimus Hat 30-Day Pack (Event)
13377 Ornithomimus Hat 7-Day Pack (Event)
12790 Ornithomimus Hat 30 day limited period
13245 Ornithomimus Hat 7-day Limited Period
13316 Ornithomimus Hat (Event) 30-day limited period
13331 Ornithomimus Hat (Event) 7-day Limited Period
that's all there is in the database/itemname.dat.
for example: http://l2.dropspoil.com/?s=ornithomimus+hat