August 11, 2010, https://bitcointalk.org/index.php?topic=782.msg8644#msg8644
Re: Lost large number of bitcoins (Bounty offered)

September 15, 2010 https://bitcointalk.org/index.php?topic=133.msg12834#msg12834
Re: Generating Bitcoins with your video card (OpenCL/CUDA)
 I will donate 1,000 BTC to whoever releases the source for a GPU (CUDA or OpenCL) client that is cross-platform once the code has been vetted by people smarter then me.

May 14, 2011,  https://bitcointalk.org/index.php?topic=8282.0
What to call 0.001 BTC? (5 BTC Bounty)

July 11, 2011,  https://bitcointalk.org/index.php?topic=27958.0
Worlds First Bitcoin Tattoo [NSFW] (Bounty claimed)

August 06, 2011 https://bitcointalk.org/index.php?topic=34773.0    
[1 BTC BOUNTY] More than 2 card issue - M4A79XTD Evo

November 23, 2011, https://bitcointalk.org/index.php?topic=52674.0
[ANN] BitcoinSpinner [1 BTC BOUNTY]

April 02, 2012,  https://bitcointalk.org/index.php?topic=75040.0
[BOUNTY] 0.5 for easy photo shop job
(MemoryDealers) Roger Ver

June 1,2012 – claimed June 29, 2012, https://bitcointalk.org/index.php?topic=90587.0
[Bounty - Claimed] Vanity address split-key generator software

Some more really early bounty threads for your list.
Also I would recommend using the date format I used here. It is consistent with the date format used in the forum. US writes 7/1/2018 UK writes 1/7/2018 so dates  can get confusing in numeric format.