IR remote - issues with getting hexcode

I have a MEGA 2560 and I am doing some programming in a school program as part of a science club. I bought a duinotech kit with a remote and IR sensor. Having read some blogs on the topic, I have tried 2 different approaches to determine the hexcodes related to different buttons on the IR remote. However, I can’t seem to get it to work at all.
The only time a code appears is when I unplug one of the cords, and even then it displays about 6 different 8-digit codes. I have attached 2 different versions of code that I found for attempting to retrieve the hexcodes

#include <IRremote.h>

const int RECV_PIN = 7;
IRrecv irrecv(RECV_PIN);
decode_results results;

void setup(){
  Serial.begin(9600);
    irrecv.enableIRIn();
}

void loop()
{
  if (irrecv.decode(&results))
    {
     Serial.println(results.value, HEX);
     irrecv.resume();
    }
}
#include <IRremote.h>

const int RECV_PIN = 7;
IRrecv irrecv(RECV_PIN);
decode_results results;

void setup(){
  Serial.begin(9600);
  irrecv.enableIRIn();
  irrecv.blink13(true);
}

void loop(){
  if (irrecv.decode(&results)){
        Serial.println(results.value, HEX);
        irrecv.resume();
  }
}