On January 8th, 2019, exactly 8 days after HappyFakeBoulder left, Timchen sent a message in oof-topic. The message reads as follows: "the ghost of happyfakeboulder wishes for me to send this to you all: https://first-to-say.happyfakeboulde.repl.co/secrets.txt". The link seemed to contain random characters:

L"*,@8T^^u=F`s-[JOy4RZj{:=P }'R?@`y,_q$("<NUe/-3*X;'%q~#~,~7@Jhnp#,EEq+;6O\!!n(*QN*'$(99V[`"5DR$(cSK]#)<q|%@+6XB{kx!zv5Bpn(M&C}JRIp$CLTa)2<FW""?>Ei|:3Nch,-{2HQM9Yhfw$MQUho9BG\uiy'{|*PQQ^t99/F/$81;@;Bv5Vpt03T$*F@Htq)ckix}D?Xr-3=Mbt 1^jr+G,8R]i90Guk3RZj{:AZg4!!.?D\tmv%+Q$'3PQ$*iV+tun4,n/-T[^q)$3@Nd+fO|e6{xe}~&&".>2j';'CK_Wa}2|8MDULZ-jU%o?*\DC6?e76&<FibxLt'w8JV%*3Qfv$mft~9WOa#'}$)=JGzs5a)75$6Bpf(2aPo+6VhtC_[r4).C\O\x919][%|%'-Fe%"3NYy,8fkt3HXe=CJl"*g6Zo.o@_n`C^jw.P

Naka was the first to point out this text encoder, which seemed to produce very similar results to HFB's message. https://repl.it/@HappyFakeboulde/Caeser-ish-text-encoder

After Leon decoded the message with the key "9", he got this:

Congratulz99JTd*ok->SRYavpzA66X<4K[d/8A<->GELla^LqK.#fjeX\FUUVkhajjzq5EL>NRmdIYRpd7+~y"x-)%=GMRzuH/}'C@Jvxw*km'g8~#"rez~D9Ie5Iz>=+ISiihl++,-5VMaWUpz/~1=9SK1>KK>!8>3;>^YT^\||x%5 '+vnr0(~#0KB/=|hscd`RP{1IZUgay@=PA@cWe76+1-J<L]nkls )+3WZYh{WZkmp7%3XEcyx (=;KOrVMQYUpllqn,UORf^(%[?jKC3O>w/$B@:DRDJNS`}P0T4[8,o~vtk^ahS#6A$76A01DO1CO=E38a6w> F(Q0&oo-UK2?@ZJW"AJ2IRUzvv,8?C$sxy+@/8PK962=A5_Og+INC)25ZG_`'l#57NWZ 3&4L84@P:sq-"B10)&6LbV^pr*36[WWlx $ROMfrqFk'3H!H^dM'9<@Mf

After being asked if he had any hints, Timchen showed this screenshot

Unfortunately, no real progress was made after this point, and the message remains undecoded.