Resuggestion, thanks to Blaze and Polar for the info! (And for Mindacos for almost snapping me)

Sale 1:

https://backpack.tf/profiles/76561198189812870#!/compare/1549756800/1549843200

https://backpack.tf/profiles/76561198148511293#!/compare/1549756800/1549843200

Keys

Sale 2:

https://backpack.tf/profiles/76561198148511293#!/compare/1550707200/1550793600

https://backpack.tf/profiles/76561198071241932#!/compare/1547856000/1551398400

Sold for Scorching Broadband

BroadBand Mini:

https://backpack.tf/suggestion/5cb019bb6780720b13467b38

Suggestion for 40 keys

Sale 3:

https://backpack.tf/profiles/76561198084126218#!/compare/1547424000/1547510400

https://backpack.tf/profiles/76561198123959574#!/compare/1547510400/1547596800

Sold for keys?

Sale 4:

https://backpack.tf/profiles/76561198364475021#!/compare/1548028800/1549065600

https://backpack.tf/profiles/76561198091696769#!/compare/1549065600/1549497600

Sold for Grail Drongo + OF Cold Killer

Drongo Mini:

https://backpack.tf/suggestion/5caed4b1d381727224218e72

Suggestion for 9.5 keys

Cold Killer Mini:

https://backpack.tf/suggestion/5cb01ae3d381723f30531fed

Suggestion for 28 keys

Total is 37.5 keys

Sale 5:

https://backpack.tf/profiles/76561198052196602#!/compare/1551571200/1551657600

SCM

Sale 6:

https://backpack.tf/profiles/76561198269636307#!/compare/1555200000/1555286400

https://backpack.tf/profiles/76561198838788284#!/compare/1555200000/1555286400

Bulk

Sale 7:

https://backpack.tf/profiles/76561198838788284#!/compare/1555200000/1555286400

https://backpack.tf/profiles/76561198132113819#!/compare/1555286400/1555372800

Sold for TW Trans

trans Mini:

https://backpack.tf/suggestion/5cdb842bd381723c34160c6f

Suggestion for 26 keys

Sale 8:

https://backpack.tf/profiles/76561198132113819#!/compare/1555372800/1555459200

https://backpack.tf/profiles/76561198002757046#!/compare/1555372800/1555459200

Sold for HG Esteem(10.25) + Searing Waxy(21)

Total is 31.25 keys

https://backpack.tf/classifieds?item=Grenade+Launcher&tradable=1&craftable=1&australium=-1&particle=702

poorly bumped seller at 38,

Blaze's Part:

https://imgur.com/a/KzCTRlh - 27 day old seller at 30 as well as another seller at 35

i'd be fine with taking 30 for Rubi's sale since it seems they value the grenade at 30.

Linking previous suggestion:

https://backpack.tf/suggestion/5cb01bda6780720db752d374